Hexavalent chromium removal in contaminated water using reticulated chitosan micro/nanoparticles from seafood processing wastes

Dima, Jimena Bernadette; Sequeiros, Cynthia; Zaritzky, Noemí Elisabet

doi:10.1016/j.chemosphere.2015.06.030

Cited by 144 publications

(70 citation statements)

References 43 publications

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“…This biopolymer has been shown to effectively remove metals such as chromium, copper, mercury and lead [7,9,25,26] from aqueous solutions. In recent years, research has been performed on novel adsorbents to maximize their adsorptive capacity [27,28]; chemical and physical modifications of chitosan have been used to increase the stability of the polymer and to improve its functionality.…”

Section: Removal Of Heavy Metals From Water Using Chitosan and Chitosmentioning

confidence: 99%

“…On the other hand, chitosan hydrogels can be obtained by ionic gelation, where micro-or nanoparticles are formed by electrostatic interactions between the positively charged chitosan chains and polyanions employed as physical cross-linkers. Chitosan reticulated microparticles (CHM) were prepared by ionic gelation of chitosan with a nontoxic reagent (tripolyphosphate), according to Calvo et al [19] and modified by Dima et al [9]. To obtain CHM, different concentrations and relative proportions of chitosan-TPP solutions were mixed under magnetic stirring; in each case, particle size was evaluated.…”

Section: Synthesis and Characterization Of Chitosan Reticulated Micromentioning

confidence: 99%

“…The shells were provided by the industry from Puerto Madryn, Patagonia, Argentina. Crude shrimp chitin was purified using acid and alkaline treatments, according to Dima et al [9]. The exoskeleton powder was treated with HCl solutions to remove minerals and then treated with aqueous sodium hydroxide solution to remove proteins.…”

Section: Chitin and Chitosan Production And Characterizationmentioning

confidence: 99%

See 2 more Smart Citations

Chitosan from Marine Crustaceans: Production, Characterization and Applications

Dima¹,

Sequeiros²,

Zaritzky³

2017

Biological Activities and Application of Marine Polysaccharides

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Chitosan is a very useful marine polysaccharide that forms structural components in the exoskeleton of crustaceans. In this chapter, the production of chitosan (CH) and chitosan reticulated micro/nanoparticles (CHM) is described. Three case studies corresponding to different effective applications of chitosan are discussed: (i) the performance of CH to destabilize oil/water emulsion waste for water clarification. It was observed that as long as colloidal charge was maintained around zero, turbidity also showed low values and water clarification was achieved. However, when the applied doses were higher than the optimum, colloidal charge and turbidity both increased, showing emulsion restabilization. Emulsions treated with the optimum chitosan doses were clarified in very short periods; (ii) CH and CHM were used as effective antibacterial agents against three different pathogenic microorganisms that are problematic for aquaculture: Vibrio alginolyticus and parahaemolyticus, and Lactococcus garvieae and the minimum bactericidal concentrations were determined; and (iii) the removal of hexavalent chromium and the comparative performance of CH versus CHM. Results showed that at pH < 2, the adsorption capacity of CHM was higher because CH is unstable. Additionally, Cr(VI) was adsorbed on CH without further reduction; in contrast, Cr(VI) adsorbed on CHM was reduced to nontoxic Cr(III).

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Section: Removal Of Heavy Metals From Water Using Chitosan and Chitosmentioning

confidence: 99%

Section: Synthesis and Characterization Of Chitosan Reticulated Micromentioning

confidence: 99%

Section: Chitin and Chitosan Production And Characterizationmentioning

confidence: 99%

See 1 more Smart Citation

Chitosan from Marine Crustaceans: Production, Characterization and Applications

Dima¹,

Sequeiros²,

Zaritzky³

2017

Biological Activities and Application of Marine Polysaccharides

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“…Cr (II), Cr (III) and Cr (VI) are the three oxidation states for chromium in nature, but only the last two are stable. Cr (III) is stable and less toxic or nontoxic, and is considered an essential element for the good health and nutrition of many organisms [3]. The recovery of chromium (III) from the leather wastes is justifiable both ecologically and economically.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Removal of Chromium by using Cow Dung as Low Cost Adsorbents

Thangavel¹,

Gopal²

2017

IJIES

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Abstract:In apparent, the intension is removal of chromium using cow dung as low cost adsorbents from the industrial wastewater. Chromium (Cr) is one of the most toxic substances and is introduced into the environment through a variety of industrial activities. In order to remove the chromium from the contaminated water there are lot of methods available, even though they are not in natural way. In the paper naturally availing material like Cow dung ash is used to remove the chromium by adsorbent method. Since the collected chromium contaminated waste water from the industry will have only a particular Cr+ concentration and pH value, an aqueous solution has been prepared with unique concentration and with different pH values. And activated ash is added separately to the aqueous solution with different dosages and varying contact periods. From the investigation and interpretation of results it has been noted that the Cow dung ash has effectively removed the chromium content when it was added 6g/l to the 1000ml of aqueous solution. In the view of contact time of the adsorbent, 3 hours of period been an ideal one and pH doesn't had a significant effect.

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mentioning

confidence: 99%